A switchable water chemistry measurement and control loop system

Abstract

The present invention relates to the field of water chemistry measurement technology, and provides a switchable water chemistry measurement and control loop system, comprising: a low-pressure water supply module for supplying water to the entire loop system; a high-temperature, high-pressure water supply module for forming a high-temperature, high-pressure water supply loop; and a switchable measurement module for measuring and controlling the water inlet and outlet of the high-temperature, high-pressure water supply loop formed by the high-temperature, high-pressure water supply module. According to an exemplary embodiment of the present invention, the switchable water chemistry measurement and control loop system can measure and control the chemical parameters of the inlet and outlet water of an autoclave using a single set of system equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of water chemistry measurement, and in particular to a switchable water chemistry measurement and control loop system. Background Art

[0002] The primary circuit of a nuclear power plant operates in a high-temperature, high-pressure water vapor environment, and relevant water chemical parameters such as dissolved oxygen, dissolved hydrogen, conductivity, and pH must be strictly controlled. Autoclaves can simulate this high-temperature, high-pressure water vapor environment, but they cannot adjust or dynamically monitor the water chemical parameters within the autoclave.

[0003] The function of a water chemistry measurement and control loop system is to provide a parameter-controlled, high-temperature, high-pressure water chemistry environment for the autoclave, meeting the operating conditions of nuclear power plant primary circuits and other applications. Conventional water chemistry measurement and control loop systems can only monitor water chemistry parameters within the water tank. Samples within the autoclave will corrode or oxidize in the high-temperature, high-pressure water vapor environment, causing changes in dissolved oxygen, dissolved hydrogen, conductivity, and pH in the autoclave outlet water, making it impossible to accurately monitor. Adding a water chemistry monitor at the autoclave outlet would inevitably incur additional costs, and the low outlet flow rate would also make it impossible to meet the measurement requirements of water chemistry instrumentation.

[0004] Therefore, how to provide a more accurate and economical measurement system has become a technical problem that needs to be solved urgently. Summary of the Invention

[0005] In view of this, in order to overcome the deficiencies of the prior art, the present invention aims to provide a switchable water chemistry measurement and control loop system to achieve measurement and control of the inlet and outlet water chemistry parameters of the autoclave using a single set of instruments.

[0006] The present invention provides a switchable water chemistry measurement and control loop system, comprising:

[0007] Low-pressure water supply module, used to supply water to the entire loop system;

[0008] High-temperature and high-pressure water supply module, used to form a high-temperature and high-pressure water supply circuit;

[0009] The switchable measuring module is used to measure and control the water outflow and inflow of the high-temperature and high-pressure water supply circuit formed by the high-temperature and high-pressure water supply module.

[0010] Furthermore, the switchable water chemical measurement and control loop system of the present invention, the low-pressure water supply module includes a first water tank, a low-pressure circulation pump, a pump outlet pipeline connecting the first water tank outlet and the low-pressure circulation pump inlet, and a pump inlet pipeline connecting the low-pressure circulation pump outlet and the first water tank inlet.

[0011] Furthermore, in the switchable water chemical measurement and control loop system of the present invention, a valve and a first flow meter connected in series with the valve are provided at the upper position of the pump inlet pipeline.

[0012] Furthermore, in the switchable water chemical measurement and control loop system of the present invention, a gas bubbler is arranged inside the first water tank, the gas bubbler is connected to the external gas source device through a gas pipeline, the gas pipeline is located at the upper position of the outer side of the first water tank and an air control valve is arranged, and a feeding system is arranged on the top of the first water tank.

[0013] Furthermore, in the switchable water chemical measurement and control loop system of the present invention, the high-temperature and high-pressure water supply module includes a booster pump, a pressure stabilizer, a heat exchanger, a preheater, an autoclave, a one-way valve, a second water tank, and a high-temperature and high-pressure pipeline connected in parallel with the pump inlet pipeline; the inlet of the high-temperature and high-pressure pipeline is connected to the outlet of the low-pressure circulation pump, and the outlet of the high-temperature and high-pressure pipeline is connected to the inlet of the first water tank; the booster pump, the pressure stabilizer, the heat exchanger, the one-way valve, and the second water tank are connected in series on the high-temperature and high-pressure pipeline in sequence;

[0014] The preheater and the autoclave are connected in series in a branch loop of the heat exchanger.

[0015] Furthermore, in the switchable chemical measurement and control loop system of the present invention, the heat exchanger is connected in series to the high-temperature and high-pressure pipeline through the high-pressure water inlet and the high-pressure return water outlet, the heat exchanger is connected to the inlet of the autoclave through the high-pressure water inlet and the high-pressure water inlet pipeline, the heat exchanger is connected to the outlet of the autoclave through the high-pressure return water inlet and the high-pressure return water pipeline, and the preheater is connected in series to the high-pressure water inlet pipeline.

[0016] Furthermore, in the switchable water chemical measurement and control loop system of the present invention, the high-temperature and high-pressure water supply module also includes a filter, a back-pressure valve, a second flow meter and a pressure gauge. The filter, back-pressure valve, second flow meter and pressure gauge are connected in series on the high-temperature and high-pressure pipeline between the heat exchanger and the one-way valve.

[0017] Furthermore, the switchable water chemistry measurement and control circuit system of the present invention includes a switchable measurement module comprising a first measurement and control pipeline, a second measurement and control pipeline, a third measurement and control pipeline, and a fourth measurement and control pipeline;

[0018] One end of the first measurement and control pipeline is connected to the lower position of the pump inlet pipeline, and the other end of the first measurement and control pipeline is connected to the second water tank. The first measurement and control pipeline is connected in series from left to right with a first one-way valve, a first normally open solenoid valve, a first normally closed solenoid valve, a second one-way valve and a recirculation pump;

[0019] One end of the second measurement and control pipeline is connected to the inlet of the first water tank, and the other end of the second measurement and control pipeline is connected to the second water tank. The second measurement and control pipeline is connected in series from left to right with a third one-way valve, a second normally open solenoid valve, a second normally closed solenoid valve, and a fourth one-way valve;

[0020] One end of the third measurement and control pipeline is connected to the first measurement and control pipeline between the first normally open solenoid valve and the first normally closed solenoid valve, and the other end of the third measurement and control pipeline is connected to the second measurement and control pipeline between the second normally open solenoid valve and the second normally closed solenoid valve. A third flow meter, a dissolved oxygen meter, a dissolved hydrogen meter, and a conductivity meter are connected in series on the third measurement and control pipeline from bottom to top.

[0021] One end of the fourth measurement and control pipeline is connected to the first measurement and control pipeline between the first normally open solenoid valve and the first normally closed solenoid valve. The fourth measurement and control pipeline is connected in series with the fourth flow meter, the pH meter and the normally closed one-way valve from bottom to top.

[0022] The switchable water chemistry measurement and control loop system of the present invention can measure and control the chemical parameters of the water inlet and outlet of the autoclave through a single set of system equipment. The water chemistry measurement and control loop can provide the autoclave with a high-temperature and high-pressure water vapor environment with controllable parameters. The switching system does not affect the stability of the high-temperature and high-pressure water supply, and a single set of instruments is used to test the water inlet and outlet of the autoclave, thereby reducing the production cost of the water chemistry measurement and control loop. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 Schematic diagram of the switchable water chemistry measurement and control loop system of the present invention.

[0025] In the figure, 1-first water tank, 2-second water tank, 3-low-pressure circulation pump, 4-boosting pump, 5-pressure stabilizer, 6-heat exchanger, 7-preheater, 8-autoclave, 9-filter, 10-back pressure valve, 11-second flow meter, 12-pressure gauge, 13-one-way valve, 14-first one-way valve, 15-first normally open solenoid valve, 16-first normally closed solenoid valve, 17-second one-way valve, 18-recirculation pump, 19-fourth one-way valve, 20-second normally closed solenoid valve, 21-second normally open solenoid valve, 22-third one-way valve, 23-first Three flow meters, 24-dissolved oxygen meter, 25-dissolved hydrogen meter, 26-conductivity meter, 27-fourth flow meter, 28-pH meter, 29-normally closed check valve, 30-valve, 31-first flow meter, 32-gas bubbler, 33-air control valve, 34-feeding system, 35-water tank water level indicator, a-pump out pipeline, b-pump in pipeline, c-high temperature and high pressure pipeline, d-high pressure water inlet pipeline, e-high pressure return pipeline, f-first measurement and control pipeline, g-second measurement and control pipeline, h-third measurement and control pipeline, i-fourth measurement and control pipeline. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments may be combined with each other; and, based on the embodiments in this disclosure, all other embodiments obtained by persons of ordinary skill in the art without creative work are within the scope of protection of this disclosure.

[0028] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this disclosure, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement an apparatus and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this apparatus and / or practice this method.

[0029] Figure 1 FIG. 1 is a schematic diagram of a switchable water chemistry measurement and control loop system according to an embodiment of the present invention. Figure 1 As shown, the loop system of this embodiment includes:

[0030] Low-pressure water supply module, used to supply water to the entire loop system;

[0031] High-temperature and high-pressure water supply module, used to form a high-temperature and high-pressure water supply circuit;

[0032] The switchable measuring module is used to measure and control the water outflow and inflow of the high-temperature and high-pressure water supply circuit formed by the high-temperature and high-pressure water supply module.

[0033] Specifically, the low-pressure water supply module includes a first water tank 1, a low-pressure circulation pump 3, an outlet pipe a connecting the outlet of the first water tank 1 with the inlet of the low-pressure circulation pump 3, and an inlet pipe b connecting the outlet of the low-pressure circulation pump 3 with the inlet of the first water tank 1. A valve 30 and a first flowmeter 31 connected in series with the valve 30 are provided above the inlet pipe b.

[0034] A gas bubbler 32 is installed within the first water tank 1. This gas bubbler 32 is connected to an external gas source (not shown) via a gas pipeline. The gas pipeline is located on the upper portion of the outer side of the first water tank 1 and includes a gas control valve 33. A charging system 34 is located at the top of the first water tank 1. In practice, the gas bubbler 32 can introduce an inert gas, such as nitrogen, into the first water tank 1 to remove dissolved oxygen from the water. A water level indicator 35 is located on the outer wall of the first water tank 1.

[0035] The high-temperature and high-pressure water supply module includes a booster pump 4, a pressure stabilizer 5, a heat exchanger 6, a preheater 7, an autoclave 8, a one-way valve 13, a second water tank 2, and a high-temperature and high-pressure pipeline c connected in parallel with the pump inlet pipeline b; the inlet of the high-temperature and high-pressure pipeline c is connected to the outlet of the low-pressure circulating pump 3, and the outlet of the high-temperature and high-pressure pipeline c is connected to the inlet of the first water tank 1;

[0036] The booster pump 4, the pressure stabilizer 5, the heat exchanger 6, the one-way valve 13 and the second water tank 2 are sequentially connected in series to the high-temperature and high-pressure pipeline c;

[0037] The preheater 7 and the autoclave 8 are connected in series to the branch circuit of the heat exchanger 6. The heat exchanger 6 is connected in series to the high-temperature and high-pressure pipeline c through the high-pressure water inlet and high-pressure return outlet. The heat exchanger 6 is connected to the inlet of the autoclave 8 through the high-pressure water inlet and outlet and the high-pressure water inlet pipeline d. The heat exchanger 6 is connected to the outlet of the autoclave 8 through the high-pressure return water inlet and high-pressure return pipeline e. The preheater 7 is connected in series to the high-pressure water inlet pipeline d.

[0038] The high-temperature and high-pressure water supply module also includes a filter 9, a back-pressure valve 10, a second flow meter 11 and a pressure gauge 12. The filter 9, back-pressure valve 10, second flow meter 11 and pressure gauge 12 are connected in series on the high-temperature and high-pressure pipeline c between the heat exchanger 6 and the one-way valve 13.

[0039] The switchable measurement module includes a first measurement and control pipeline f, a second measurement and control pipeline g, a third measurement and control pipeline h and a fourth measurement and control pipeline i;

[0040] One end of the first measurement and control line f is connected to the lower portion of the pump inlet line b, and the other end of the first measurement and control line f is connected to the second water tank 2. The first measurement and control line f is connected in series from left to right with a first one-way valve 14, a first normally open solenoid valve 15, a first normally closed solenoid valve 16, a second one-way valve 17, and a recirculation pump 18.

[0041] One end of the second measurement and control pipeline g is connected to the inlet of the first water tank 1, and the other end of the second measurement and control pipeline g is connected to the second water tank 2. The second measurement and control pipeline g is connected in series from left to right to the third one-way valve 22, the second normally open solenoid valve 21, the second normally closed solenoid valve 20, and the fourth one-way valve 19.

[0042] One end of the third measurement and control line h is connected to the first measurement and control line f between the first normally open solenoid valve 15 and the first normally closed solenoid valve 16. The other end of the third measurement and control line h is connected to the second measurement and control line g between the second normally open solenoid valve 21 and the second normally closed solenoid valve 20. The third measurement and control line h is connected in series from bottom to top to a third flowmeter 23, a dissolved oxygen meter 24, a dissolved hydrogen meter 25, and a conductivity meter 26.

[0043] One end of the fourth measurement and control pipeline i is connected to the first measurement and control pipeline f between the first normally open solenoid valve 15 and the first normally closed solenoid valve 16. The fourth measurement and control pipeline i is connected in series with the fourth flow meter 27, the pH meter 28 and the normally closed one-way valve 29 from bottom to top.

[0044] In practical applications, the application principle of the low-pressure water supply module in the switchable water chemical measurement and control loop system of this embodiment is as follows:

[0045] The water in the first water tank 1 enters the low-pressure circulation pump 3 through the pump-out pipe a and returns to the first water tank 1 through the pump-in pipe b. The valve 30 set at the upper position of the pump-in pipe b and the first flow meter 31 set in series with the valve 30 respectively control and monitor the flow rate of the fluid in the pump-in pipe b.

[0046] In practical applications, the application principle of the high-temperature and high-pressure water supply module in the switchable water chemical measurement and control loop system of this embodiment is as follows:

[0047] The high-temperature and high-pressure pipeline c draws water from the low-pressure circulation pump 3, passes through the booster pump 4, the pressure stabilizer 5, the heat exchanger 6 and the preheater 7, and enters the autoclave 8. The water in the autoclave 8 passes through the heat exchanger 6, the filter 9, the one-way valve 13 and the second water tank 2 and enters the first water tank 1; the back pressure valve 10 and the second flow meter 11 respectively control and monitor the flow rate of the fluid in the high-temperature and high-pressure pipeline c; the pressure gauge 12 monitors the pressure in the high-temperature and high-pressure pipeline c.

[0048] In practical applications, the principle of the switchable measurement module in the switchable water chemical measurement and control loop system of this embodiment to measure and control the water inlet of the high-temperature and high-pressure water supply loop formed by the high-temperature and high-pressure water supply module is as follows:

[0049] The fluid in the first measurement and control pipeline f enters the first water tank 1 through the first one-way valve 14, the first normally open solenoid valve 15, the third flowmeter 23, the dissolved oxygen meter 24, the dissolved hydrogen meter 25, the conductivity meter 26, the second normally open solenoid valve 21 and the third one-way valve 22 to complete the measurement of dissolved oxygen, dissolved hydrogen and conductivity; the fluid is discharged after passing through the fourth flowmeter 27, the pH meter 28 and the normally closed one-way valve 29 to complete the pH measurement.

[0050] In practical applications, the principle of the switchable measurement module in the switchable water chemical measurement and control loop system of this embodiment to measure and control the water output of the high-temperature and high-pressure water supply loop formed by the high-temperature and high-pressure water supply module is as follows:

[0051] Close the first normally open solenoid valve 15 and the second normally open solenoid valve 21, and open the first normally closed solenoid valve 16 and the second normally closed solenoid valve 20;

[0052] The first measurement and control pipeline f draws water from the second water tank 2, passes through the recirculation pump 18, the second one-way valve 17, the first normally closed solenoid valve 16, the third flowmeter 23, the dissolved oxygen meter 24, the dissolved hydrogen meter 25, the conductivity meter 26, the second normally closed solenoid valve 20 and the fourth one-way valve 19, and enters the second water tank 2; the dissolved oxygen, dissolved hydrogen and conductivity are measured; the fluid is discharged after passing through the fourth flowmeter 27, the pH meter 28 and the normally closed one-way valve 29, and the pH measurement is completed.

[0053] The switchable water chemistry measurement and control loop system of the present invention can measure and control the chemical parameters of the water inlet and outlet of the autoclave through a single set of system equipment. The water chemistry measurement and control loop can provide the autoclave with a high-temperature and high-pressure water vapor environment with controllable parameters. The switching system does not affect the stability of the high-temperature and high-pressure water supply, and a single set of instruments is used to test the water inlet and outlet of the autoclave, thereby reducing the production cost of the water chemistry measurement and control loop.

[0054] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A switchable water chemistry measurement and control loop system, characterized in that: The circuit system includes: Low-pressure water supply module, used to supply water to the entire loop system; High-temperature and high-pressure water supply module, used to form a high-temperature and high-pressure water supply circuit; A switchable measurement module is used to measure and control the water outflow and inflow of the high-temperature and high-pressure water supply circuit formed by the high-temperature and high-pressure water supply module; The low-pressure water supply module comprises a first water tank (1), a low-pressure circulation pump (3), a pump outlet pipeline (a) connecting the outlet of the first water tank (1) and the inlet of the low-pressure circulation pump (3), and a pump inlet pipeline (b) connecting the outlet of the low-pressure circulation pump (3) and the inlet of the first water tank (1); The high-temperature and high-pressure water supply module comprises a booster pump (4), a pressure stabilizer (5), a heat exchanger (6), a preheater (7), an autoclave (8), a one-way valve (13), a second water tank (2), and a high-temperature and high-pressure pipeline (c) connected in parallel with the pump inlet pipeline (b); the inlet of the high-temperature and high-pressure pipeline (c) is connected to the outlet of the low-pressure circulation pump (3), and the outlet of the high-temperature and high-pressure pipeline (c) is connected to the inlet of the first water tank (1); the booster pump (4), the pressure stabilizer (5), the heat exchanger (6), the one-way valve (13), and the second water tank (2) are connected in series to the high-temperature and high-pressure pipeline (c); the preheater (7) and the autoclave (8) are connected in series to the branch circuit of the heat exchanger (6); The switchable measurement module includes a first measurement and control pipeline (f), a second measurement and control pipeline (g), a third measurement and control pipeline (h) and a fourth measurement and control pipeline (i); One end of the first measurement and control pipeline (f) is connected to the lower position of the pump inlet pipeline (b), and the other end of the first measurement and control pipeline (f) is connected to the second water tank (2). The first measurement and control pipeline (f) is connected in series from one end to the other end with a first one-way valve (14), a first normally open solenoid valve (15), a first normally closed solenoid valve (16), a second one-way valve (17) and a recirculation pump (18); One end of the second measurement and control pipeline (g) is connected to the inlet of the first water tank (1), and the other end of the second measurement and control pipeline (g) is connected to the second water tank (2). The third one-way valve (22), the second normally open solenoid valve (21), the second normally closed solenoid valve (20), and the fourth one-way valve (19) are connected in series from one end to the other end of the second measurement and control pipeline (g); One end of the third measurement and control pipeline (h) is connected to the first measurement and control pipeline (f) between the first normally open solenoid valve (15) and the first normally closed solenoid valve (16), and the other end of the third measurement and control pipeline (h) is connected to the second measurement and control pipeline (g) between the second normally open solenoid valve (21) and the second normally closed solenoid valve (20). The third flow meter (23), the dissolved oxygen meter (24), the dissolved hydrogen meter (25) and the conductivity meter (26) are connected in series from one end to the other end of the third measurement and control pipeline (h); One end of the fourth measurement and control pipeline (i) is connected to the first measurement and control pipeline (f) between the first normally open solenoid valve (15) and the first normally closed solenoid valve (16), and then connected in series with the fourth flow meter (27), the pH meter (28) and the normally closed one-way valve (29).

2. The switchable water chemistry measurement and control loop system according to claim 1, characterized in that: A valve (30) and a first flow meter (31) connected in series with the valve (30) are provided at an upper position of the pumping pipeline (b).

3. The switchable water chemistry measurement and control loop system according to claim 1, characterized in that: A gas foamer (32) is provided inside the first water tank (1), and the gas foamer (32) is connected to an external gas source device via a gas pipeline. The gas pipeline is located at an upper position outside the first water tank (1) and an air control valve (33) is provided. A feeding system (34) is provided at the top of the first water tank (1).

4. The switchable water chemistry measurement and control loop system according to claim 3, characterized in that: The heat exchanger (6) is connected in series to the high-temperature and high-pressure pipeline (c) through the high-pressure water inlet and the high-pressure return water outlet. The heat exchanger (6) is connected to the inlet of the autoclave (8) through the high-pressure water inlet and the high-pressure water inlet pipeline (d). The heat exchanger (6) is connected to the outlet of the autoclave (8) through the high-pressure return water inlet and the high-pressure return water pipeline (e). The preheater (7) is connected in series to the high-pressure water inlet pipeline (d).

5. The switchable water chemistry measurement and control loop system according to claim 3, characterized in that: The high-temperature and high-pressure water supply module further comprises a filter (9), a back-pressure valve (10), a second flow meter (11) and a pressure gauge (12), wherein the filter (9), the back-pressure valve (10), the second flow meter (11) and the pressure gauge (12) are connected in series on the high-temperature and high-pressure pipeline (c) between the heat exchanger (6) and the one-way valve (13).

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